Barry Faulkner’s striking art deco mosaic mural “Intelligence Awakening Mankind” seems invisible to the steady flow of people walking below it. Yet a careful look at this image will show at least one person in this scene using her intelligence -- a woman stands studying a document between a pair of potted shrubs, braced against the wall of Rockefeller Center’s GE Building. This is the Sixth Avenue entrance to 30 Rockefeller Plaza, home to NBC’s studios. Built in 1933, this skyscraper is the centerpiece of Rockefeller Center. It was known as the RCA Building until 1988. Today the 70 story building is often called by its nickname “30 Rock,” based on an NBC TV show.